PayTm hot trending app, cash transactions are not secure - world is getting digital. Paytm is world wide accepted in most of countries, most of the websites are accepting online transaction with payTm, even you can pay for apps on play store.
Shop online, buy airline tickets, pay to other PayTm subscribers. You can recharge PayTm with your debit card or credit card, even can transfer money to your bank account. Other wonderfull is you get cash back on cash payments to merchants.